Revelers prepare for the Festa da Bugiada, a traditional folk event held annually to celebrate St. John, in Sobrado, Valongo, Portugal on June 24. The Festa da Bugiada is an ancient tradition which unfolds in the form of a struggle between Moors and Christians, known locally as Mourisqueiros and Bugios.

Paulo Duarte / AP

Revelers perform down the street in the Festa da Bugiada in Portugal on June 24.

Paulo Duarte / AP

A festive mask is worn by a reveler in the Festa da Bugiada in Portugal on June 24.